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 > RPMs dropping uphill, Ford f-450

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ksss

Eastern Idaho

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Posted: 09/09/20 07:18pm Link  |  Quote  |  Print  |  Notify Moderator

Medium duty trucks typically make less hp and torque than a 350/3500 and thats a lot to pull up a grade. The truck is capable of a much stiffer duty cycle of hard work, but to make that possible the power is detuned. If you didn't throw a code, I would guess the truck is running correctly. If it went into limp mode it would throw a code.


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Grit dog

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Posted: 09/09/20 08:02pm Link  |  Quote  |  Print  |  Notify Moderator

sch911 wrote:

A 5% grade and the altitude would cause additional load. If your maxed out in high gear you will slow down. Simple physics. Period.

There's almost zero altitude effect on a forced induction engine at that low altitude. Even a NA engine is only down about 7-8% from sea level (theoretically).

And @ksss, Ford didn't detune the F450 pickups, they were 400/800, but the C&C trucks took a serious hit, like only 300/660 or something like that. Super turds.
Still OP's truck may have just run outta steam.

However, until we hear what gear, rpms and speed, it's anyone's guess.


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RAS43

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Posted: 09/09/20 08:15pm Link  |  Quote  |  Print  |  Notify Moderator

Since the truck is new to you is all of the maintenance up to date, especially fuel filters? Could just be something simple.

NRALIFR

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Posted: 09/09/20 08:58pm Link  |  Quote  |  Print  |  Notify Moderator

The 2013 F450 pickup isn’t a medium duty truck. The GVWR is 14K, so it’s still a class 3.

You’re not letting the cruise control drive it on steep grades are you? Unless there’s a check engine light, I’m going to say this is just a lack of familiarity with the truck. Make sure Tow/Haul mode is on, and perhaps be a bit more aggressive with anticipating the need for downshifting, and throttle. Use the +/- buttons on the shifter to force a down shift and lock it out of 6th, or even 5th if needed.

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azdryheat

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Posted: 09/09/20 09:16pm Link  |  Quote  |  Print  |  Notify Moderator

I recently got some bad diesel and couldn't climb grades. Once I got better fuel it was back to pulling great. Maybe it's your fuel.


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Mote

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Posted: 09/10/20 06:06am Link  |  Quote  |  Print  |  Notify Moderator

That's a pretty camper even for an F450. You're bound to slow down on most grades.
Like others have stated I would start with making sure the air filter and both fuel filters have been changed recently. Dirty filters will restrict the engine ability of making it's full power.
The noise and vibration are probably the engine cooling fans kicking in high. They are pretty large and make a lot of noise if pulling really hard.


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ShinerBock

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Posted: 09/10/20 07:16am Link  |  Quote  |  Print  |  Notify Moderator

If the OP's truck has a pickup bed on it from the factory, then it is not detuned. Chassis cab trucks have to go through a different emissions certification than complete trucks, and this difference in emissions certifications is the reason why they make less hp than complete trucks. Basically, chassis cab trucks have to control NOx at full load while complete trucks do not. This allows for the complete trucks to make more power since the EGR is not used under full load like it is on chassis cabs.

OP, even big mighty diesel trucks will slow down with enough weight, drag, and grade. As stated before, I would lock out 6th when towing that heavy up grades. Like mine, your truck has two overdrive gears, 5th and 6th, and in my opinion 6th is overdrive for unloaded or small loads while 5th is overdrive for medium to heavy loads.

Now if it generally doesn't slow down up these hills and it is just starting to then that is another issue and the first place I would look is your fuel filter. It may be clogged and you are not getting enough fuel to make the power needed. If you have a way to check actual and commanded fuel rail pressure then this will let you know you are either not getting enough fuel or the truck is defueling to keep temps in check. If it is commanding more that actual than you are not getting enough fuel and likley have a clogged filter. If it is commanding less than max(26-29k psi) and actual mirrors what is commanded then the engine is defueling itself to keep temps in check. Another issue may be turbo overseed which the turbo for those years was notorious for, but it would have thrown a check engine light for that.

* This post was edited 09/10/20 07:25am by ShinerBock *

noteven

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Posted: 09/10/20 07:56am Link  |  Quote  |  Print  |  Notify Moderator

A 9000 lbs truck plus 15000 lbs trailer will feel a 5% grade due to gravity.

The adaptive transmission takes a bit if time to relearn the truck is hauling something vs idling around in double overdrive in empty bob tail mode.

Grit dog

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Posted: 09/10/20 09:45am Link  |  Quote  |  Print  |  Notify Moderator

Apparently OP isn’t interested in adding any more info.
Musta realized he had it locked in hi gear in manual mode or something.

cavie

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Posted: 09/10/20 11:52am Link  |  Quote  |  Print  |  Notify Moderator

When towing always keep it in tow mode. Also drop it back one gear normal drive and leave it there.


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